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SILVER ASH (Ehretia acuminata)
Trade Name
Silver ash
Scientific Name
Ehretia acuminata (DC.) R. Br.
Family
BORAGINACEAE
Common Names
Shaursi; Puran; Punyan; Punya; Punna; Punjlaurai; Panden; Pandayan; Narra; Nalshuna; Kurkuria; Koda; Kalthanu; Kala-aja; Churnwood; Chillay; Bual; Brown cedar; Australian silky ash; Arjun; Silver ash; Kalibuning (Philippines); Sembung ijo (Indonesia); Tanaua (Philippines); Kaai kom (Thailand); Kendal maesa (Indonesia); Kendal kebo (Indonesia); Silky ash; Sang (Laos); Taw-petsut (Myanmar); Kom (Thailand); Balulai (Philippines); Petthin (Myanmar)
Scientific Name Synonyms
Ehretia thyrsiflora (Siebold & Zucc.) Nakai; Ehretia taiwaniana Nakai; Ehretia serrata var. obovata Lindl.; Ehretia polyantha DC.; Ehretia kantonensis Masam.; Ehretia argyi H. Lév.; Cordia thyrsiflora Siebold & Zucc.
Description Of The Tree
Botanical Description
It is a small to medium sized tree, up to 30 m tall and 65 cm diameter, with a straight bole. It is usually fluted at the base.
Natural Habitat
This species prefers well drained soils from the lowlands to montane forests, up to 2,100 m of altitude.
Wood Identification
Anatomic Description Of Wood
Occasionally vessels in tangential pattern. Occasionally vessels in dendritic pattern. Occasionally vessels in diagonal and/or radial pattern. Occasionally wood semi-ring porous and/or ring porous. Occasionally vessels in radial multiples of 4 or more common. Axial parenchyma in marginal or in seemingly marginal bands. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Two cells per parenchyma strand. Axial parenchyma in narrow bands on lines 4 to 10 rays per mm (medium). Occasionally rays less than 4 per mm (rare). Occasionally rays of two distinct sizes. Occasionally larger rays more than 4 seriate. Occasionally body ray cells procumbent with one row of upright and/or square marginal cells (Krib Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The wood is pale brown, pale yellow or yellowish-brown.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
The grain is frequently interlocked.
Texture
Texture is usually medium to coarse.
Luster
This species is fairly lustrous.
Natural Durability
The heartwood is very resistant to dry-wood termites. The sapwood is resistant to Lyctus.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.51
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.55
Total shrinkage Tangential (Saturated to 0%MC) (%)
9.3
Total shrinkage Radial (Saturated to 0%MC) (%)
5.3
Drying Defects
Ease of Drying: Air seasoning of Rengas is reported to be good. Drying Defects: Slight checking and warping are reported.
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.8
Wood Chemical Properties
Wood Mechanical Properties
Workability
Machining
Machining operations are rather easy.
Turning
30
REFERENCED USES
End Uses Summary
HOUSING GENERAL, FURNITURE AND CABINETS, TURNING, cutlery, SPORTS, TOOLS, tool handles, NAVAL CONSTRUCTION, boat deck
General Housing
- 10 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Turning
- 30 - Embassy of Honduras in Japan
Knife Handles
- 33 - Embassy of Gabon in Japan
Sports
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Boat Decking
- 59 - Programa Nacional de uso Sostenible de los Bosques e Incremento a las Exportaciones.
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